* Heat Exchanger?

it is the equipment used for the purpose of heating or cooling another fluid with a fluid;
recently, research and development for high-performance of the heat changer is actively in progress for energy saving and size miniaturization of the device using the heat exchanger. 

* Classification of the Heat Exchanger according to the purpose of use 

- Heater : It's a heat exchanger used for heating a fluid up to the required temperature

- Preheater : It's a heat exchanger used for making the efficiency better in the next operation(process) by heating a fluid in advance. 

- Superheater : It's a heat exchanger used for heating a fluid(generally, gas)until it comes to an overheat condition. 

- Evaporator : It's a heat exchanger used for evaporating liquids by heating them. 

- Re-heater : It's a heat exchanger used for evaporating the condensed liquid in the device(for the sake of process) by re-heating it. 

- Cooler : It's a heat exchanger used for cooling a fluid up to the required temperature. 

- Condenser : It's a heat exchanger used for cooling & condense-liquifying the condensable gas, and the heat exchanger which makes steam into water by condensing steam is called Condenser.